Device to correct an unbalance of the rotor of turbine engines

Claim 1

A device to correct the imbalance of a rotor in a turbojet engine wherein the rotor is mounted on a shaft having two segments joined so as to rotate together, the shaft segments defining coaxially aligned bores, a portion of a first shaft segment having a plurality of flutes extending into the bore and a portion of a second shaft segment defining internal threads, the device comprising: (a) a packing ring member disposed in the coaxially aligned bores, the packing ring defining a bore therethrough and engaging the first and second shaft segments so as to retain them in assembled relationship; (b) a blocking piece disposed within the bore in the packing ring and attached to the packing ring, the blocking piece and the packing ring having interengaging flutes to prevent relative rotation between them, the blocking piece defining a bore therethrough with a transverse wall extending across the bore and flutes extending along at least a portion of the bore; (c) a balancing piece having (i) a cylindrical body with flutes along at least a portion of its outer surface, the cylindrical body being disposed with the bore of the blocking piece such that its flutes engage those flutes on the bore of the blocking piece, (ii) a cylindrical part attached to the cylindrical body, the cylindrical part and the cylindrical body being disposed coaxially with bores in the first and second shaft segments, and (iii) an eccentric part attached to the cylindrical part; and, (d) fastening means to attach the cylindrical body of the balancing piece to the transverse wall of the blocking piece such that the circumferential position of the eccentric part may be oriented and fixed in position to offset any imbalance in the rotor and shaft structure.

Claim 2

A device to correct the imbalance of a rotor in a turbojet engine wherein the rotor is mounted on a shaft having two segments joined so as to rotate together, the shaft segments defining coaxially aligned bores, a portion of a first shaft segment having a plurality of flutes extending into the bore and a portion of a second shaft segment defining internal threads, the device comprising: (a) a packing ring member disposed in the coaxially aligned bores, the packing ring defining a bore therethrough and engaging the first and second shaft segments so as to retain them in assembled relationship; (b) a blocking piece disposed within the bore in the packing ring and attached to the packing ring, the blocking piece and the packing ring having interengaging flutes to prevent relative rotation between them, the blocking piece defining a bore therethrough with a transverse wall extending across the bore and flutes extending along at least a portion of the bore; (c) a balancing piece having (i) a cylindrical body with flutes along at least a portion of its outer surface, the cylindrical body being disposed with the bore of the blocking piece such that its flutes engage those flutes on the bore of the blocking piece, (ii) a cylindrical part attached to the cylindrical body, the cylindrical part and the cylindrical body being disposed coaxially with bores in the first and second shaft segments, and (iii) an eccentric part attached to the cylindrical part; and, (d) fastening means to attach the cylindrical body of the balancing piece to the transverse wall of the blocking piece such that the circumferential position of the eccentric part may be oriented and fixed in position to offset any imbalance in the rotor and shaft structure.